Linear Voltage Regulators

A Linear Voltage Regulator ensures the output voltage from the circuit is maintained at a specific voltage.

The device acts as a variable resistor, continuously adjusting to maintain a constant output voltage. The regulated voltage must be lower than the input voltage. Simple voltage regulator contains a Zener Diode and a resistor but more complicated versions include elements like a voltage reference and error amplifiers.

A more specific type of regulator are Low Dropout Voltage Regulators (LDO) which can regulate voltage even when the power supply voltage is very close to the supply voltage.


How to choose linear voltage regulator ICs?


The primary feature in choosing a regulator is usually the Output voltage as the main purpose of one is to regulate the voltage to a specific value such as 3.3V. Its accuracy to this voltage across temperature and load current is another consideration as is its maximum load. The dropout voltage value will be particularly important with battery applications.


How to test a linear voltage regulator?


  1. Set your multimeter to the voltage setting
  2. Check the datasheet to determine which pins are the ground, input and output.
  3. Attach the red wire to the input and the black wire to the ground, the multimeter should give a reading higher than the regulators' output value. If not then there is a power supply issue.
  4. Attach the red to the ground and the black wire the output, the multimeter should then give the regulators' output value (plus minus its accuracy). If not then the regulator is likely to be faulty.

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Description Price Output Voltage Maximum Output Current Package Type Output Type Mounting Type Minimum Input Voltage Maximum Input Voltage Pin Count Power Rating Minimum Operating Temperature Maximum Operating Temperature Number of Outputs Polarity Accuracy
RS Stock No. 298-8564
Mfr. Part No.L7824CV
SGD0.69
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24 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 168-6611
Mfr. Part No.L78M08CV
SGD0.769
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8 V 500mA TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 686-9814
Mfr. Part No.L78M08CV
SGD0.769
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8 V 500mA TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 168-6062
Mfr. Part No.L7824CV
SGD0.575
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24 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 536-1401
Mfr. Part No.LM78L12ACM/NOPB
SGD1.21
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12 V 100mA SOIC Fixed Surface Mount 13.7 V 35 V 8 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 102-5754
Mfr. Part No.LM78L12ACM/NOPB
SGD1.051
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12 V 100mA SOIC Fixed Surface Mount 13.7 V 35 V 8 0.75W 0 °C +125 °C 1 Positive ±5%
RS Stock No. 124-6450
Mfr. Part No.BA17805FP-E2
BrandROHM
SGD0.773
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5 V 1A TO-252 Fixed Surface Mount 7.5 V 25 V 3 - -40 °C +85 °C 1 Positive ±4%
RS Stock No. 102-5710
Mfr. Part No.LM350T/NOPB
SGD3.468
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1.2 → 33 V 3A TO-220 Adjustable Through Hole 4.2 V 35 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 168-6065
Mfr. Part No.L78M12CV
SGD0.769
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12 V 500mA TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 714-7780
Mfr. Part No.L78S05CV
SGD0.889
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5 V 2A TO-220 Fixed Through Hole 8 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 714-0679
Mfr. Part No.L78L05ACUTR
SGD0.592
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5 V 100mA SOT-89 Fixed Surface Mount - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS Stock No. 298-8609
Mfr. Part No.L78M12CV
SGD0.93
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12 V 500mA TO-220 Fixed Through Hole - 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 168-6799
Mfr. Part No.L78L05ACUTR
SGD0.202
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5 V 100mA SOT-89 Fixed Surface Mount - 30 V 3 - 0 °C +150 °C 1 Positive ±5%
RS Stock No. 102-3530
Mfr. Part No.L78S05CV
SGD0.889
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5 V 2A TO-220 Fixed Through Hole 8 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 535-9408
Mfr. Part No.LM350T/NOPB
SGD2.73
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1.2 → 33 V 3A TO-220 Adjustable Through Hole 4.2 V 35 V 3 25W 0 °C +125 °C 1 Positive -
RS Stock No. 168-7135
Mfr. Part No.L7812CV-DG
SGD0.72
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12 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS Stock No. 168-6536
Mfr. Part No.L78S75CV
SGD1.09
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7.5 V 2A TO-220 Fixed Through Hole 10.5 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 793-1355
Mfr. Part No.L7812CV-DG
SGD0.744
Each (In a Pack of 10)
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12 V 1.5A TO-220 Fixed Through Hole - 35 V 3 - 0 °C +125 °C 1 - -
RS Stock No. 686-9026
Mfr. Part No.L78S75CV
SGD1.09
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7.5 V 2A TO-220 Fixed Through Hole 10.5 V 35 V 3 - 0 °C +150 °C 1 Positive -
RS Stock No. 918-1975
Mfr. Part No.L7812CV
SGD0.564
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12 V 1.5A TO-220 Fixed Through Hole - 40 V 3 - 0 °C +125 °C 1 Positive -
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